Malicious PDF — malware analysis report

Static analysis result for SHA-256 5325efe8b3a2543d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 12:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec26af1ae723cda90522f84f667989e5 SHA-1: 1a2fe9b8b8730c407ccdf0d72c8a9eb74999f9c5 SHA-256: 5325efe8b3a2543d505d77da7caaad4228be68abc13a6b2701072ab12abb4697
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wix?keyword=banderas+de+la+primera+guerra+mundial
    • https://cdn.shopify.com/s/files/1/0435/7645/9425/files/honda_trail_50.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/17006061085.pdf
    • https://cdn.shopify.com/s/files/1/0431/7826/2689/files/lanigewabidi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/tosegejew.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/zolopupuwur.pdf
    • https://static.usrfiles.com/ugd/b8c837_51de7105e05e4e798e6da468956b3eb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_95bde3f0ece449be9e72462082bb8498.pdf
    • https://static.usrfiles.com/ugd/5ad03d_d5027d967c7a44fc90eadabf5a3aaf7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4561c2183f94120b0ed500ba06b6d3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_467f2dc5953d4a34aabb7284f47b995b.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb8444e3457a4832bae96b7ddb14674a.pdf
    • https://static.usrfiles.com/ugd/4b68be_7943a48bcae84df3ade9f000bfb5fc7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_17db77abc1ae44e0948b522787e92986.pdf
    • https://static.usrfiles.com/ugd/b8c837_83b72741332b4774bce30abf6f9c790c.pdf
    • https://cdn.shopify.com/s/files/1/0438/3539/2150/files/javascript_open_json_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3494/files/36429883321.pdf
    • https://cdn.shopify.com/s/files/1/0430/9866/9220/files/pdf_file_download_in_php_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/65121572511.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/56291471364.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c03.bin
d2aa51c0992b926ea30042f53887f38a0c3c0af0796b68bc3a29f6a268f60272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C03 5328 bytes
font_01_sfnt_off00007e03.bin
a382e03ab717fd0c979dec240da48720710b78de974631ab3fd0d96ed9cbc40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E03 11216 bytes

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